> On 07/02/2019 17:07, jes...@krogh.cc wrote: > Thanks for your explanation. In your case, you have low concurrency > requirements, so focusing on latency rather than total iops is your > goal. Your current setup gives 1.9 ms latency for writes and 0.6 ms for > read. These are considered good, it is difficult to go below 1 ms for > writes. As Wido pointed, to get latency down you need to insure you have > C States in your cpu settings ( or just C1 state ), you have no low > frequencies in your P States and get cpu with high GHz frequency rather > than more cores (Nick Fisk has a good presentation on this), also avoid > dual socket and NUMA. Also if money is no issue, you will get a bit > better latency with 40G or 100G network.
Thanks a lot. I'm heading towards the conclusion that if I went all in and got new HW+NVMe drives, then I'd "only" be about 3x better off than where I am today. (compared to the Micron paper) That's a usefull conclusion to take back. -- Jesper _______________________________________________ ceph-users mailing list firstname.lastname@example.org http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com